It is important to note that both the Stokes term and the boundary layer term have been found without using any sophisticated mathematical approach. On the contrary, they have been found by a probabilistic genetic algorithm. The emergence of the boundary layer term in Eqs. (REF ) and (REF ) without human intervention can be added to the experimental and numerical results that support boundary layer theory, even though there is no general mathematical proof of its existence, as mentioned by Batchelor [1]}.
